Fig. 5: Photoluminescence characteristics.

a Schematic diagram of photoluminescence in the photodetector. b Large area photoluminescence mapping image inside the red box (scale bar: 100 μm). c Photoluminescence spectra of four representative position marked by the black, green, red, and blue dot in Fig. 5b. d Photoluminescence spectra of three representative position marked by the green, red, and blue cross in Fig. 4b. The photoluminescence intensity mapping of the blue box region in Fig. 4b at the extracted Fabry–Pérot interference wavelengths of e 524.2 nm (trough), f 520.7 nm (peak), g 517.3 nm (trough), and h 513.1 nm (peak). The scale bar is 1 μm. The wavelength and optical power used in the mapping measurement are 532 nm and 10.42 mW, respectively.